Ben Dennis, 17, has started his own app development business. His earnings: $20,000 to $30,000 a year.

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He owns Dennis Tech, a Fishers-based mobile application development company. He has made more than 30 apps that have been downloaded more than 500,000 times. He has earned tens of thousands of dollars.

He attends Fishers Chamber of Commerce events and networks with businesses across the country. ...